Methods
Unicenter prospective study. Consecutive patients with persistent AF referred for ablation were included. EAM was performed with Carto3 mapping system (Biosense Webster, Inc.). We recorded bipolar signals, first in AF and later in sinus rhythm (SR) after electrical cardioversion. Two thresholds delimited low-voltage areas (LVA): 0.5 and 0.3mV. We compared LVA extension between maps in SR and AF in each patient.